Considerable people are encountering the same problems of global entry login and some of them including me solve their problems. I will tell you what should you need to do just look below:
1) Visit the official website and email him for your every.
2) Take a Screen Shot of their every issue and attach it to complaint mail. You also need to include your registered email id and password and send the mail.
3) After this there is another solution that you can follow. You can contact your Trusted Traveler Agenda client services via the customer care phone number- 4567**********(Example).
If you want more details about this you have to visit here: https://www.triphippies.com/global-entry-login/